On 06/05/2011 02:47 PM, Andreas Schild wrote:
Hi
The first part might sound like I am in the wrong group, but bear with
me...
(I probably am, but I googled up and down RAID and LVM lists and I am
still stuck):
I have a software RAID 5 with 4 disks and LVM on top. I had one volume
group with two logical volumes (for root and data).
I wanted to upgrade capacity and started by failing a drive, replacing
it with a bigger one and let the RAID resync. Worked fine for the
first disk. The second disk apparently worked (resynced, all looked
good), but after a reboot the system hung.
After some back and forth with superblocks (on the devices, never on
the array) I was able to re-assemble the array clean.
The system still does not reboot though: "Volume group "cmain" not found".
I booted a live cd, assembled the array and did a pvck on the array
(/dev/md0):
"Could not find LVM label on /dev/md0"
pvdisplay /dev/md0 results in:
No physical volume label read from /dev/md0
Failed to read physical volume "/dev/md0"
I do not have a backup of my /etc/ and therefore no details regarding
the configuration of the LVM setup (yes, I know...)
All I have of the broken system is the /boot partition with its content
Several questions arise:
- Is it possible to "reconstitute" the LVM with what I have?
- Is the RAID array really ok, or is it possibly corrupt to begin with
(and the reason no LVM labels are around)?
- Should I try to reconstruct with pvcreate/vgcreate? (I shied away
from any *create commands to not make things worse.)
- If all is lost, what did I do wrong and what would I need to backup
for a next time?
Any ideas on how I could get the data back would greatly be
appreciated. I am in way over my head, so if somebody knowledgeable
tells me: "you lost, move on" would be bad, but at least would save me
some time...
Thanks,
Andreas
Have you tried 'vgscan -vvv' and 'pvscan -vvv' when started from a
usb-stick or bootable dvd-rom? It might give you some more info. (post
it here)
Ger.
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